And why would MS want to do that?

A MS & Nintendo partnership exclusively in Japan?

I strongly believe that is a great idea and will benefit both, but I doubt MS will do that.
And if that happens, I expect the usual fools on the internet to keep suggesting MS is going 3rd party.....as if they were idiots.

I think this can work. Both companies just need to agree, and MS to sacrife the little trust and popularity they have in Japan (as a hardware manufacturer), which is not a big deal if you look at the big picture. Xbox is important in EU. That's where the push needs to happen.

Furthermore, I think MS would benefit from putting & developing games on the 3DS too.

It's like a match made in Hell.

If you read the opening post he tells you why.  I disagree with him but it's there for all to see. 

Nintendo and Sony is the ideal partnership. Both traditional consoles from Japan. Sony caters mainly to adults or kids who like games aimed at adults and Nintendo is the opposite. So basically the two of them united would cater for absolutely everybody. Microsoft with all their billions will never stand a chance of taking over the market and gaming as many of us know it will continue until we're old and only care for Wii Fit 58 on the WiiStation 14.

Only on the 5th of November, given by Mr. T, at the eleventh hour where the sun rises.

To sell their games and hurt sony.  Bad reasons imo but he did say why.

In my opinion the only reason Nintendo hasn't left the console business altogether is because their handheld business model is so freaking successful that they have enough money to try and score things like the Wii. The 3ds costs way less than the wii u to make (the new 3ds probably doesn't cost THAT much more to develop than the originals, yet it is more expensive by a good amount) and they are selling it for more of a profit than the wii u is currently. The 3ds games probably cost 1/4-1/2 (at most) the cost to develop compared to the HD wii U games, yet they are typically sold for $40 (which is roughly 2/3 - 4/5 of what Wii U games are sold for when brand new). Nintendo makes an INSANE amount of profit off their 3ds business and Microsoft could produce/develop cheap games that sell JUSt as well and profit an INSANE amount more than their HD games.

Look at the modern pokemon, youk watch, puzzles and dragon type games on the 3ds. They are a JOKE in terms of difficult to make and resources required compared to games like HD Halo, FF, or Zelda, yet they sell MILLIONS more than any of those games most of the time. Handhelds are the way to go for profit, because consumers (including myself) are just too dumb to realize we are buying games that are considerably less visually impressive than the HD ones at a price point that is laughable, yet we do it anyway lol.

Games on 3ds sell for (typically) $40. App games typically are free, but most probably cost $1 and MOSt people don't spend money on microtransactions but let's just say that people spend enough on microtransactions to bump up the average money made from each game $5 per person (I think that's fair), that would mean that Microsoft's app game would have to sell 800,000 units in order to make the same profit that a $40 game could make with only 100,000 units sold on the 3ds. Now, which one of those sounds more logical? You could argue the cost of development for app games isn't nearly as much but that is simply wrong. Look at pokemon on the 3ds and tell me that game cost more to develop than temple runner lol. 

Nobody is going to believe you. But its also what I'm saying as the next gen GPUs (512GB/s bandwidth !!) will run circles around PS4/XOne. And as settop-boxes also need an OS - its no wonder that Microsoft is readying that and the XOne includes that functionality...

The 2016 Facebook console will use the next-gen AMD x86 design using stacked RAM. And as there are only a handful of Oculus Rift games and even less that run Linux only - we can expect that Microsoft is already in negoiation with Facebook about the "Games for Windows" stuff...